Fixed the flaky test in the ProtectedPathSpec

[izadorozhna]

Implements #5390 Related to #5608

• Fixed the test "Flow swaps to protected path when main path gets broken, becomes DEGRADED if protected path is unable to reroute(no bw)"
• Earlier in some cases when the switchPair was set to 2-3 or 8-9, the protected path had only 1 ISL and it had enough BW, so the test failed because the BW was not reduced for some protected path ISLs.
• Now this test passes even when the swPair is 2-3 or 8-9, and other switches. So the temporary fix to skip 8-9 switches is removed.
• Removed the workaround to skip 8-9 switches from 2 tests (valid when #5645 is merged)

[izadorozhna]

Please see my comments and screenshots under #5608 issue

[izadorozhna]

Closing since the fix was not correct. It was not correct to break the used ISLs in protected or main path.

[izadorozhna]

The new PR will be created instead